SU844627A1 - Grease for cold drawing of pipes - Google Patents

Description

(54) LUBRICATION FOR COLD EMBODIMENTS The invention relates to the processing of metals by pressure and can be used for straight-free and correct drawing of electric welded pipes from carbon steaks. The use of electric welded pipes in some cases is preferable to seamless ones. In this connection, improving the quality of electric-welded pipes is one of the most important tasks. Mandatory drawing of welded pipes is the most productive process of pipe deformation, but it accompanies with high energy costs for overcoming the forces of contact friction. In electrowelded pipes, the structures of the base metal and the welded dinenera (seam) are different. The seam is less ductile than the base metal, tentatively by 10%. . The main function of technical lubricants when drawing is to reduce the contact friction forces, prevent metal from sticking to the tool, and, consequently, to obtain a high-quality surface. TUBE Machine oil is used as a lubricant for drawing welded pipes (TI T-308, 1960, MTZ). This lubricant is suitable only for debugging drawing of pipes and does not provide the required quality of the surface of the pipes. Polymer pressure lubricant, a solution of tar soaps ll. This lubricant is used only with phosphate coating. In this connection, additional chemical treatment of the surface is required (cleanup, activation, activation, passivation, application of a phosphate coating), which increases the laboriousness of the process and worsens the sanitary and hygienic working conditions, as vapors of acids and alkalis are released into the environment. In addition, after applying the lubricant, special drying is required. The closest in composition to the proposed lubricant is a lubricant containing an alkyl aromatic fraction with the addition of —spermaceto-oil, hydrosulfurized oil, and chlorinated paraffin 21..

Such lubrication does not ensure the process of drawing electric-welded pipes, since metal sticks to the tool, i.e. does not possess sufficient anti-shear and anti-friction properties. The use of the aromatic fraction as a basis leads to a deterioration of sanitary and hygienic working conditions, since the lubricant has a strong odor. In addition, the composition of the lubricant includes deficient materials (spermaceti oil).

The aim of the invention is to improve the anti-shrink and anti-friction properties of the lubricant used for cold drawing electric welded pipes.

To achieve the goal, cold-drawing tubular grease containing chlorinated paraffin additionally contains secondary fatty alcohols fractions a mixture of mono- and dialkyl phosphates, which is the product of the reaction of synthetic secondary fatty alcohols fractions with a phosphorylating agent (mixture of alkyl phosphates) in the following ratio, components, wt.% :

Chlorinated paraffin 30-40 Secondary fatty alcohols of fraction C, o-CjQ 15-20 Mixture of mono- and dialkyl phosphates Else The following materials are used to prepare the lubricant: Chlorinated paraffin TU 6-01-511-76 Secondary fatty alcohols TU 38-30717-74

A mixture of synthetic mono - and dialkyl phosphates of secondary fatty alcohols TU 38-40778-76

5 The proposed lubricant is prepared by simple mixing of the components and is applied to the pipes by dipping, dipping, or being fed into the deformation zone through the pipeline. A known lubricant is prepared as follows. Osner.

0 spermaceti oil and then the resulting salified oil is mixed with all other components. Apply grease on the tubes by dipping.

The compositions of the proposed (No. 1-3) and 5 known (No. 4) lubricants are given in table 1.

The compositions of the proposed and well-known lubricants are tested on the friction machine (MT-1) when drawing electric-welded pipes from steel of steel grade 10, BCP. The antifriction properties of the tested lubricant compositions are determined by the magnitude of the coefficient of friction, dragging, and the extreme pressure

Table 1

properties according to the state of the surface of the strip after dragging. At the same time, 55 for each of the variants were carried out in 10 tests. -Every case of damage to the band is estimated at 10% scrap.

The results of testing the lubricants of compositions No. 1-4 are given in table 2.

Friction coefficient Dragging force, kg

Pipe surface quality

Cleanliness class

Drawing characteristic

Claims (2)

Reject percentage Comparative tests showed. that the proposed lubricant, in contrast to the known one, has better anti-seize properties - there is no sticking of the metal to the tool and antifriction properties - the coefficient of friction of the proposed lubricant is 0.029-0.044, and known 0, 08-2, the drag force on my proposed lubricant is 310-345 kg, on the famous - 420 kg. It has been established that the samples protruded on lubricants of composition No. 1-3 have a purity class of 10, on lubricant hP 4 purity class 9, On lubricants of composition No. 1-3, 200 m tubes of steel grade Art. 8K on the route 57x2 46x1,5. The process of drawing on lubricants of composition No. 3 was satisfactory: there was no tremor and pipe breaks, there was no sticking of the metal. When drawing the pipes. On the lubricant of composition No., there was a tremor, breakages of the pipes and sticking of the metal to the tool. Claims for Cold Draw Pipe Containing Chlorinated PA3 0.044 0.029 .0,082 345 310 420 No stick Sticking 10 10 9 Smooth Smooth Weak friction 000 raffin, characterized in that, in order to increase antifriction and extreme pressure properties, the lubricant additionally contains secondary fatty alcohols of fraction C, o-C; 0I mixture of mono-and dialkyl phosphates, which is the product of the reaction of synthetic secondary fatty alcohols of fraction QQ- C / dS phosphorylating agent, in the following ratio of components, wt.%: Chlorinated paraffin 30-40 Secondary fatty alcohols of the Cda-Cad fraction 15-20 Mixture of mono- and dialkyl phosphates, which is the product of the reaction of the synthetic secondary fatty alcohols of the C-Cad fraction phosphorylating agent Other sources of information received note in the examination 1.Avtorskoe USSR Certificate 472150, Cl. C 10 M 5/14, 197b. 2. The patent of France No. 1408358, cl. With 10gp, pub. 1965 (prototype).